Introduction to types of PLC power supplies

PLC Power Supply Types

2026 Industrial Intelligence Report

Five types of PLC power supplies explained. Here's from field experience.

Five Types

1. AC Power Supply

Input: 120/240VAC

Output: 24VDC

Use: Large systems

2. DC Power Supply

Input: 12/24VDC

Output: 5/12/24VDC

Use: Small systems

3. UPS

Feature: Battery backup

Use: Critical apps

Runtime: Minutes

4. SMPS

Type: Switch-mode

Efficiency: High

Use: Standard now

5. Redundant

Feature: Dual power

Use: Critical systems

Failover: Auto

SMPS is now standard—efficient and compact. UPS for critical, redundant for nothing-less.

— Senior Controls Engineer

Comparison

Type Efficiency Size Cost>
AC Linear Low Large Low
DC Medium Small Medium
SMPS High Small Medium
UPS N/A Medium High
Redundant High Large Very high
Pro-Tip: SMPS is now standard—90% of new PLCs use switch-mode.

Choose UPS for critical, redundant for nothing-less.

FAQ

+Most common type?
SMPS—switch-mode power supply. 90% of new installations.
+When use UPS?
Critical processes only—power loss = damage. Not for everything.
+Redundant needed?
Control rooms, safety systems only. Not standard applications.

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